ECE Symposium on Problems Relating to Environment, Prague, 1971, & United Nations. Economic Commission for Europe. (1971). Proceedings and documentation of the symposium organized by the United Nations Economic Commission for Europe and held from 2 to 15 May 1971 in Prague (Czechoslavakia) with a stdy tour to the region of Ostrava (Czechoslovakia) and Katowice (Poland). United Nations.
Chicago Style (17th ed.) CitationECE Symposium on Problems Relating to Environment, Prague, 1971, and United Nations. Economic Commission for Europe. Proceedings and Documentation of the Symposium Organized by the United Nations Economic Commission for Europe and Held from 2 to 15 May 1971 in Prague (Czechoslavakia) with a Stdy Tour to the Region of Ostrava (Czechoslovakia) and Katowice (Poland). New York: United Nations, 1971.
MLA (9th ed.) CitationECE Symposium on Problems Relating to Environment, Prague, 1971, and United Nations. Economic Commission for Europe. Proceedings and Documentation of the Symposium Organized by the United Nations Economic Commission for Europe and Held from 2 to 15 May 1971 in Prague (Czechoslavakia) with a Stdy Tour to the Region of Ostrava (Czechoslovakia) and Katowice (Poland). United Nations, 1971.